.tool-description {
    margin: 0 0 24px;
    color: rgba(255, 255, 255, 0.68);
    line-height: 1.6;
    font-size: 0.95rem;
}

.note-display {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 12px;
    margin: -6px 0 24px;
}

.note-display span {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.note-display small {
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* =========================
   SPECTRUM
========================= */

#spectrumCanvas {
    width: 100%;
    height: 300px;
    display: block;
    margin: 22px 0;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: linear-gradient(
        180deg,
        rgba(255, 255, 255, 0.025),
        rgba(255, 255, 255, 0.008)
    );
}

/* =========================
   SOURCE CONTROLS
========================= */

.analyzer-source-controls {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 10px;
    align-items: stretch;
}

.analyzer-source-controls button {
    min-height: 46px;
}

.source-btn.active {
    background: #e2b830;
    color: #050505;
    border-color: #e2b830;
}

.source-status {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin: 12px 0 22px;
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.07);
    background: rgba(255, 255, 255, 0.025);
}

.source-status span {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.45);
}

.source-status strong {
    font-size: 0.8rem;
    font-weight: 500;
    text-align: right;
}

/* =========================
   DATA CARDS
========================= */

.analyzer-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-top: 22px;
}

.analyzer-card {
    padding: 18px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.025);
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.analyzer-card small {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.09em;
}

.analyzer-card strong {
    font-size: 1.25rem;
    font-weight: 600;
}

/* =========================
   FREQUENCY BANDS
========================= */

.spectrum-info {
    margin-top: 34px;
}

.frequency-bars {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 16px;
}

.frequency-band {
    display: grid;
    grid-template-columns: 65px 110px 1fr;
    align-items: center;
    gap: 12px;
}

.frequency-band span {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.65);
}

.frequency-band strong {
    font-size: 0.78rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.45);
}

.band-meter {
    position: relative;
    height: 8px;
    border-radius: 99px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.07);
}

.band-fill {
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: currentColor;
    transition: width 0.08s linear;
}

/* =========================
   PEAKS
========================= */

.detected-frequencies {
    margin-top: 34px;
}

.peak-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 16px;
}

.peak-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 13px 15px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.07);
    background: rgba(255, 255, 255, 0.02);
}

.peak-item span {
    width: 26px;
    height: 26px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.73rem;
}

.peak-item strong {
    font-size: 0.95rem;
    font-weight: 500;
}

/* =========================
   BUTTON STATES
========================= */

#freezeBtn:disabled {
    opacity: 0.35;
    cursor: default;
}

#currentFrequency {
    min-width: 140px;
    text-align: center;
}

#signalLevel,
#dominantFrequency,
#tuningOffset,
#sampleRateDisplay,
#availableSpectrum {
    font-variant-numeric: tabular-nums;
}

/* =========================
   RESPONSIVE
========================= */

@media (max-width: 760px) {
    #spectrumCanvas {
        height: 230px;
    }

    .analyzer-grid {
        grid-template-columns: 1fr;
    }

    .analyzer-source-controls {
        grid-template-columns: 1fr;
    }

    .frequency-band {
        grid-template-columns: 55px 95px 1fr;
        gap: 8px;
    }

    .frequency-band strong {
        font-size: 0.7rem;
    }

    .note-display {
        flex-direction: column;
        align-items: center;
        gap: 4px;
    }

    .note-display span {
        font-size: 1.7rem;
    }
}

@media (max-width: 480px) {
    #spectrumCanvas {
        height: 190px;
        border-radius: 12px;
    }

    .frequency-band {
        grid-template-columns: 48px 1fr;
    }

    .frequency-band strong {
        display: none;
    }

    .analyzer-card {
        padding: 15px;
    }

    .analyzer-card strong {
        font-size: 1.1rem;
    }
}